Finding the Fourth Proportional to 12,877.78, 19,303.35 and 7,319.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,877.78 : 19,303.35 = 7,319.15 : x
2. Step 2: Convert to fraction form
   12,877.78/19,303.35 = 7,319.15/x
3. Step 3: Cross multiply
   12,877.78x = 19,303.35 × 7,319.15
4. Step 4: Simplify right side
   12,877.78x = 141,284,114.15
5. Step 5: Solve for x
   x = 141,284,114.15/12,877.78
6. Step 6: Final answer
   x = 10,971.15